Add balance auto reload

Closes #329

test/system/registrar_area/settings/balance_auto_reload_test.rb

@@ -0,0 +1,74 @@
+require 'test_helper'
+
+class RegistrarAreaSettingsBalanceAutoReloadTest < ApplicationSystemTestCase
+  setup do
+    @registrar = registrars(:bestnames)
+    @user = users(:api_bestnames)
+    sign_in @user
+  end
+
+  def test_enables_balance_auto_reload
+    amount = 100
+    threshold = 10
+    assert_nil @registrar.settings['balance_auto_reload']
+
+    visit registrar_account_path
+    click_on 'Enable'
+    fill_in 'Amount', with: amount
+    fill_in 'Threshold', with: threshold
+    click_button 'Save'
+
+    assert_current_path registrar_account_path
+    assert_text 'Balance Auto-Reload setting has been updated'
+
+    # Using `number_to_currency` leads to `expected to find text "Reload 100,00 € when your balance
+    # drops to 10,00 €" in "...Reload 100,00 € when your balance drops to 10,00 €...`
+    assert_text 'Reload 100,00 € when your balance drops to 10,00 €'
+  end
+
+  def test_disables_balance_auto_reload
+    @registrar.update!(settings: { balance_auto_reload: { type: {} } })
+
+    visit registrar_account_path
+    click_on 'Disable'
+
+    assert_current_path registrar_account_path
+    assert_text 'Balance Auto-Reload setting has been disabled'
+  end
+
+  def test_edits_balance_auto_reload
+    @registrar.update!(settings: { balance_auto_reload: { type: { name: 'threshold',
+                                                                  amount: 100,
+                                                                  threshold: 10 } } })
+
+    visit registrar_account_path
+    within '.balance-auto-reload' do
+      click_on 'Edit'
+    end
+    fill_in 'Amount', with: '101'
+    fill_in 'Threshold', with: '11'
+    click_button 'Save'
+
+    assert_current_path registrar_account_path
+    assert_text 'Balance Auto-Reload setting has been updated'
+  end
+
+  def test_form_is_pre_populated_when_editing
+    amount = 100
+    threshold = 10
+    @registrar.update!(settings: { balance_auto_reload: { type: { name: 'threshold',
+                                                                  amount: amount,
+                                                                  threshold: threshold } } })
+
+    visit edit_registrar_settings_balance_auto_reload_path
+
+    assert_field 'Amount', with: amount
+    assert_field 'Threshold', with: threshold
+  end
+
+  def test_user_of_epp_role_cannot_edit_balance_auto_reload_setting
+    @user.update!(roles: [ApiUser::EPP])
+    visit registrar_account_path
+    assert_no_text 'Balance Auto-Reload'
+  end
+end